From 2eded212580b3e810a79561a3adc227f633bc8ec Mon Sep 17 00:00:00 2001 From: Vikas Ramsingh Rajput Date: Sat, 14 Mar 2020 23:17:58 +0300 Subject: [PATCH] BAEL-3832: Difference between BeanFactory and ApplicationContext completed --- spring-core-3/pom.xml | 7 + .../bean/CustomBeanFactoryPostProcessor.java | 16 ++ .../bean/CustomBeanPostProcessor.java | 17 +++ .../baeldung/ioccontainer/bean/Student.java | 12 ++ .../ioccontainer/IOCContainerAppTest.java | 137 ++++++++++++++++++ .../ioc-container-difference-example.xml | 11 ++ 6 files changed, 200 insertions(+) create mode 100644 spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanFactoryPostProcessor.java create mode 100644 spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanPostProcessor.java create mode 100644 spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/Student.java create mode 100644 spring-core-3/src/test/java/com/baeldung/ioccontainer/IOCContainerAppTest.java create mode 100644 spring-core-3/src/test/resources/ioc-container-difference-example.xml diff --git a/spring-core-3/pom.xml b/spring-core-3/pom.xml index 205259e8e4..d1163a174c 100644 --- a/spring-core-3/pom.xml +++ b/spring-core-3/pom.xml @@ -67,6 +67,12 @@ ${junit-jupiter.version} test + + + log4j + log4j + ${log4j.version} + @@ -83,6 +89,7 @@ 2.22.1 1.3.2 2.2.2.RELEASE + 1.2.17 \ No newline at end of file diff --git a/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanFactoryPostProcessor.java b/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanFactoryPostProcessor.java new file mode 100644 index 0000000000..d6e2c92144 --- /dev/null +++ b/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanFactoryPostProcessor.java @@ -0,0 +1,16 @@ +package com.baeldung.ioccontainer.bean; + +import org.apache.log4j.LogManager; +import org.apache.log4j.Logger; +import org.springframework.beans.BeansException; +import org.springframework.beans.factory.config.BeanFactoryPostProcessor; +import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; + +public class CustomBeanFactoryPostProcessor implements BeanFactoryPostProcessor { + static final Logger LOGGER = LogManager.getLogger(CustomBeanPostProcessor.class.getName()); + + @Override + public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { + LOGGER.info("BeanFactoryPostProcessor is Registered"); + } +} diff --git a/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanPostProcessor.java b/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanPostProcessor.java new file mode 100644 index 0000000000..bf34453388 --- /dev/null +++ b/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/CustomBeanPostProcessor.java @@ -0,0 +1,17 @@ +package com.baeldung.ioccontainer.bean; + +import org.apache.log4j.LogManager; +import org.apache.log4j.Logger; +import org.springframework.beans.BeansException; +import org.springframework.beans.factory.config.BeanPostProcessor; + +public class CustomBeanPostProcessor implements BeanPostProcessor { + + static final Logger LOGGER = LogManager.getLogger(CustomBeanPostProcessor.class.getName()); + + public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { + LOGGER.info("BeanPostProcessor is Registered Before Initialization"); + return bean; + } + +} diff --git a/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/Student.java b/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/Student.java new file mode 100644 index 0000000000..e32b4ecc29 --- /dev/null +++ b/spring-core-3/src/main/java/com/baeldung/ioccontainer/bean/Student.java @@ -0,0 +1,12 @@ +package com.baeldung.ioccontainer.bean; + +import org.apache.log4j.LogManager; +import org.apache.log4j.Logger; + +public class Student { + static final Logger LOGGER = LogManager.getLogger(Student.class.getName()); + + public void postConstruct() { + LOGGER.info("Student Bean is initialized"); + } +} diff --git a/spring-core-3/src/test/java/com/baeldung/ioccontainer/IOCContainerAppTest.java b/spring-core-3/src/test/java/com/baeldung/ioccontainer/IOCContainerAppTest.java new file mode 100644 index 0000000000..b97aa08f80 --- /dev/null +++ b/spring-core-3/src/test/java/com/baeldung/ioccontainer/IOCContainerAppTest.java @@ -0,0 +1,137 @@ +package com.baeldung.ioccontainer; + +import static org.junit.jupiter.api.Assertions.assertFalse; +import static org.junit.jupiter.api.Assertions.assertTrue; + +import java.util.ArrayList; +import java.util.List; + +import org.apache.log4j.AppenderSkeleton; +import org.apache.log4j.Logger; +import org.apache.log4j.spi.LoggingEvent; +import org.junit.jupiter.api.AfterEach; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; +import org.springframework.beans.factory.BeanFactory; +import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; +import org.springframework.beans.factory.xml.XmlBeanFactory; +import org.springframework.context.ApplicationContext; +import org.springframework.context.support.ClassPathXmlApplicationContext; +import org.springframework.core.io.ClassPathResource; +import org.springframework.core.io.Resource; + +import com.baeldung.ioccontainer.bean.CustomBeanFactoryPostProcessor; +import com.baeldung.ioccontainer.bean.CustomBeanPostProcessor; +import com.baeldung.ioccontainer.bean.Student; + +public class IOCContainerAppTest { + + private LogAppender logAppender; + private List loggingEvents; + + @BeforeEach + public void initializeLogAppender() { + logAppender = new LogAppender(); + Logger.getRootLogger() + .addAppender(logAppender); + loggingEvents = logAppender.events; + } + + @AfterEach + public void removeLogAppender() { + Logger.getRootLogger() + .removeAppender(logAppender); + } + + @Test + public void whenBFInitialized_thenNoStudentLogPrinted() { + Resource res = new ClassPathResource("ioc-container-difference-example.xml"); + BeanFactory factory = new XmlBeanFactory(res); + + String expected = "Student Bean is initialized"; + assertFalse(checkWhetherLoggerContains(expected)); + } + + @Test + public void whenBFInitialized_thenStudentLogPrinted() { + + Resource res = new ClassPathResource("ioc-container-difference-example.xml"); + BeanFactory factory = new XmlBeanFactory(res); + Student student = (Student) factory.getBean("student"); + + String expected = "Student Bean is initialized"; + assertTrue(checkWhetherLoggerContains(expected)); + } + + @Test + public void whenAppContInitialized_thenStudentObjInitialized() { + ApplicationContext context = new ClassPathXmlApplicationContext("ioc-container-difference-example.xml"); + + String expected = "Student Bean is initialized"; + assertTrue(checkWhetherLoggerContains(expected)); + } + + @Test + public void whenBFInitialized_thenBFPProcessorAndBPProcessorNotRegAutomatically() { + Resource res = new ClassPathResource("ioc-container-difference-example.xml"); + ConfigurableListableBeanFactory factory = new XmlBeanFactory(res); + + String beanFactoryPostProcessorExpectedLog = "BeanFactoryPostProcessor is Registered"; + assertFalse(checkWhetherLoggerContains(beanFactoryPostProcessorExpectedLog)); + + String beanPostProcessorExpectedLog = "BeanPostProcessor is Registered Before Initialization"; + assertFalse(checkWhetherLoggerContains(beanPostProcessorExpectedLog)); + } + + @Test + public void whenAppContInitialized_thenBFPostProcessorAndBPostProcessorRegisteredAutomatically() { + ApplicationContext context = new ClassPathXmlApplicationContext("ioc-container-difference-example.xml"); + + String beanFactoryPostProcessorExpectedLog = "BeanFactoryPostProcessor is Registered"; + assertTrue(checkWhetherLoggerContains(beanFactoryPostProcessorExpectedLog)); + + String beanPostProcessorExpectedLog = "BeanPostProcessor is Registered Before Initialization"; + assertTrue(checkWhetherLoggerContains(beanPostProcessorExpectedLog)); + } + + @Test + public void whenBFPostProcessorAndBPProcessorRegisteredManually_thenReturnTrue() { + Resource res = new ClassPathResource("ioc-container-difference-example.xml"); + ConfigurableListableBeanFactory factory = new XmlBeanFactory(res); + + CustomBeanFactoryPostProcessor beanFactoryPostProcessor = new CustomBeanFactoryPostProcessor(); + beanFactoryPostProcessor.postProcessBeanFactory(factory); + String beanFactoryPostProcessorExpectedLog = "BeanFactoryPostProcessor is Registered"; + assertTrue(checkWhetherLoggerContains(beanFactoryPostProcessorExpectedLog)); + + CustomBeanPostProcessor beanPostProcessor = new CustomBeanPostProcessor(); + factory.addBeanPostProcessor(beanPostProcessor); + Student student = (Student) factory.getBean("student"); + String beanPostProcessorExpectedLog = "BeanPostProcessor is Registered Before Initialization"; + assertTrue(checkWhetherLoggerContains(beanPostProcessorExpectedLog)); + } + + private boolean checkWhetherLoggerContains(String expectedLogMessge) { + boolean isLogExist = loggingEvents.stream() + .anyMatch(logEvent -> logEvent.getMessage() + .equals(expectedLogMessge)); + return isLogExist; + } + + public static class LogAppender extends AppenderSkeleton { + public List events = new ArrayList(); + + public void close() { + } + + public boolean requiresLayout() { + return false; + } + + @Override + protected void append(LoggingEvent event) { + events.add(event); + } + + } +} diff --git a/spring-core-3/src/test/resources/ioc-container-difference-example.xml b/spring-core-3/src/test/resources/ioc-container-difference-example.xml new file mode 100644 index 0000000000..9bb01efe66 --- /dev/null +++ b/spring-core-3/src/test/resources/ioc-container-difference-example.xml @@ -0,0 +1,11 @@ + + + + + + + + \ No newline at end of file